A state-dependent dissipation potential is used to add arbitrary elastic domains to variational phase-field fracture models while keeping degradation and strength criteria separate.
Approximation of a Brittle Fracture Energy with a Constraint of Non-Interpenetration
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abstract
Linear fracture mechanics (or at least the initiation part of that theory) can be framed in a variational context as a minimization problem over a SBD type space. The corresponding functional can in turn be approximated in the sense of $\Gamma$-convergence by a sequence of functionals involving a phase field as well as the displacement field. We show that a similar approximation persists if additionally imposing a non-interpenetration constraint in the minimization, namely that only nonnegative normal jumps should be permissible. 2010 Mathematics subject classification: 26A45
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Endowing variational phase-field fracture models with custom strength criteria
A state-dependent dissipation potential is used to add arbitrary elastic domains to variational phase-field fracture models while keeping degradation and strength criteria separate.